Cap for the breather pipes of internal combustion engines



July 25, 1933. J. P. BROWN 1,919,709

CAP FOR THE BREATHER PIPES OF INTERNAL COMBUSTION ENGINES Original Filed June 18, 1931 Patented July 25, 1933 UNITED STATES.

J CKsoN'r. BROWN, or MONTOURSVILLE, PENNSYLVANIA CAP ron THE BREATHER rIrEs or INTERNAL COMBUSTION ENGINES Application filed .Tune 18, 1931, Serial No. 545,306. Renewed March 25, 1933.

This invention relates to a cap for the breather pipe of an internal combustion en.- gine, and has for one of its objects to provide a device of this character which shall 'be adapted to utilize the current of air generated by the cooling fan to effect the Withdrawal of vapors from the crank case, which.

shall be adapted to prevent the oil from being discharged from the crank case by way m 'of the breather pipe, and which shall be adapted to be readily removed from the breather pipe to permit the refilling of the crank case. I

With the foregoing and other objects in 5' View, the nature of which will appear as the description proceeds, the invention consists in. the construction, combination and arrangement of parts hereinafter fully described and claimed, and illustrated in the accompanying drawing, wherein Figure 1 is a view in side elevation of an internal combustion engine having its breather pipe equipped with a 7 cap constructed in accordance with my invention.

5" Figure 2 is a top plan view of the cap,

andv v Figure 3 is a sectional view taken on the line 3-3 of Figure 2. 7

Referring i detail .to the drawing, 1

designates the cylinder block,2 the crank case, 3 the breather pipe, and 4 the cooling fan of a conventional internal combustion] en ine.

The cap for the breather pipe, which is generally designated 5, comprises a hollow body 6 and a hollow attaching member 7."

The body 6 is closed at its front end and fully open at its rear end, and the attaching ,member 7 extends downwardly from the "body at a point close to the front end of the latter. The front end portion of the body 6 is of conical formation, as shown at 6a, and the body. gradually increases in diameter from its front end. portion to its "rear end; The attaching member '7 which is fully open at its ends is in full communi-- cation at its upper end with the interior of the body 6, and decreases in diameter from its upper to its lower end. The cap 51s applied to the breather pipe 3 by inserting front closed end thereof to and of and longitudinally with relation to the current of air generated by the fan 4, and

also in a manner to position its closed coni- 5 .cal e'nd'portion 6a faclng the current of air. 7

The air flows about the body 6 from the pass the rear open end thereof, with the result that the suction is produced at the rear open end of the body which draws vapors from the crank case 2. e

As the front end of the body 6 is closed, as the front end portion 6a is of conical formation, and as the body increases in di- 5 A ameter from its front end portion to its 7 rear end, it offers little resistance to the air current and causes the air current to produce a strong action at its" rear end. The body 6 occupies an upwardly and rearwardly inclined position with relation to its attaching member 7 and to the breather pipe 3, with the result that any oil forced into the body is returned to the crank case 2, with the result that comparatively little or no oil will be lost through the breather pipe. The cap is simple, may be made from sheet metal and of different sizes for ap lication to breather pipes of different sizes, and it may be manufactured and sold Iata comparatively low cost. While I have described the principle of the invention, together with the structure which I now consider the preferred embodi- 95, ment thereof, it is to be understood that the structure shown is merely illustrative and that such changes may be made, when ventionas claimed.

What is claimed is e A cap for the breather pipe of an internal combustion engine, comprising a hollow body closed at its front and open at its 5 rear end and provided in its lower side with an opening, the front end portion of the body being of conical formation and JACKSON P. BROWN. 

